jq:tldr:7cf6c
This command takes the contents of a JSON file and passes it to the jq command for further processing.
${cat filename-json}: This portion uses the cat command to read and output the contents of the file specified by filename-json. The $ sign is used for variable substitution, so the actual value of filename-json will be substituted here.
|: This is a pipe symbol used to redirect the output of the previous command as input to the next command.
jq '.': This part executes the jq command with a period (.) argument. jq is a command-line JSON processor that allows you to manipulate and extract data from JSON files. The period argument . represents the root object of the JSON, so this command will simply print the entire JSON structure as output without any modification.
In summary, the command reads the contents of a JSON file using cat, passes it to jq for processing, and finally prints the JSON structure as output.